<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            margin: 0;
            padding: 0;
        }
        header{
            height: 60px;
            background-color: gray;
        }
        main{
            height: 600px;
            
        }
        .left{
            float: left;
            width: 30%;
            height: 100%;
            background-color: pink;
        }
        .right{
            float: right;
            width: 70%;
            height: 100%;
            background-color: lightblue;
        }
        footer{
            height: 60px;
            background-color: gray;
        }
    </style>
</head>
<body>
    <header>

    </header>
    <main>
        <div class="left"></div>
        <div class="right"></div>
    </main>
    <footer>

    </footer>
</body>
</html>